Electropneumatic brake.



Patented Nov. 5, 1918.

3 Mi E9 INVENTOH PVTuPner Woalie WALTER V. TURNER, 0F WILKINSBURG, PENNSYLVANIA, ASSIGNUR TO THE WESTING- HUUSE R BRAKE COMPANY, 015 WILNEERDING, PENNSYLVANIA, A CORPORATION 0P" PENNSYLVANIA.

manner,

To all whom it may concern Be it known that T, WALTER V. TURNER, a citizen of the United States, residing at Wilkinsburg, in the county of Allegheny and State of Pennsylvania, 'have invented new and useful Improvements in Electropneumatic Brakes, of which the following is a specification. y

This invention relates to electro pneumatic brakes, and has for its principal object to improve on the construction covered by my prior pending application, Serial No. 158,185, filed March 29, 1917. I

In the above application, an electric magneto generator operated by fluid under pressure from the brake system is employed for generating current to efiect the simultaneous transmission of the braking action throughout the train.

The magneto generator comprises permanent magnets and an armature having a coil in which electric current is generated by moving the permanent magnets away from the coil.

With the above construction, the magnetic lines of force of themagnets only cut the coil once when the device is actuated, so that large magnets are required in order to generate suiiicient current for the required purose.

p The to and fro movement of the permanent magnets also tends to jar same, and this has a tendency to weaken the magnetic force.

Another difliculty is that dirt particles are liable to lodge between the contacting surfaces of the magnets and the armature, so that an air gap is introduced which reduces the number of lines of force cut when the magnets are pulled away from the armature and consequently the amount of current generated is reduced.

According to my present invention, the above diliiculties are overcome by employing a megneto having a rotating armature.

In the accompanying drawing; Figure 1 is a sectional view of an electro-pneumatic brake device embodying my invention, and Fig. 2 'an elevational view of the magneto portion thereof. a

As shown in the drawing, the construo tion may. comprise a triple valve device it Specification of Letters Patent.

Patented Nov, TAT,

' Application filed September It, 11917. eeriallt'o. 1913M.

having a bracket 2, attached to the rear head and to which is secured an electropneumatic portion 3.

The triple valve device 1 may comprise the usual casing having a piston chamber 4 connected to brake pipe 5 and containing-piston 6 and valve chamber 7 connected by passage 8 and pipe 9 to auxiliary reservoir 10 and containing a main slide valve 11 and a graduating slide valve 12.

The electro-pneumatic portion 3 may comprise a casing containing a relay valve 13, a

7 pilot valve 14 controlled by a magnet 15,

reservoir l0'through passage 21 to the outerv seated area of the relay valve 13 and thence equalizes through a restricted port 22 to the opposite side of vsaid valve, and the pilot valve 14: being normally closed, fluid pressures equalize on opposite sides of the relay valve 13, so that spring 23 can hold the relay valve seated, the inner seated area of the relay valve being subject to the atmospheric pressure at this time, through passage 2t, cavity 25 in slide valve 11 and exhaust port 26.

In a service application of the brakes, the operation is. the same as usual, the triple valve device operating'upon a gradual reduction in brake pipe pressure to supply fluid from the auxiliary reservoir 10 to the brake cylinder 27.

Upon making a sudden'reduction in brake pipe pressure, however, to effect an emergency application of the brakes, the triple valve piston 6 moves to emergency application position and uncovers passage 24. liluid is then supplied from the auxiliary reservoir to passage 24 and flows to passage as leading to piston 20, so that said piston All . port 32.

The relay valve 13 is then shifted to its open position in which fluid is supplied from the auxiliary reservoir 10 through passage 21 to passage 28 and thence past check valve 33 to a passage 34 leading to the piston chamber of the usual quick action piston 35, thus causing the quick action piston to actuate the quick action valve 36 so as tovent fluid from the brake pipe 5 and thus produce quick serial action throughout the train.

Fluid supplied topassage 28 also flows to the piston 20 and operates same to cause the rotation of the magneto armature, as before described. Current generated by the magneto on this car is then supplied to other adjacent cars so far as the voltage generated is able to carry it.

In order to obtain increased rotative movement of the magneto armature, a flywheel 37 is mounted on the armature shaft and when the piston 20 moves out, the teeth of rack 19 finally move out of engagement with the teeth of pinion 18 and this permits the momentum of the fly wheel to rotate the magneto armature to some extent after therack has ceased its movement.

In order to release the brakes, the brake Having now described my invention, what I claim as new and desire to secure by Letters Patent, is

1. In an electropneumatic brake, the combination with a device controlled by fluid under pressure for effecting an application of the brakes, of an electric generator having a rotatable armature, means operated by fluid under pressure for effecting the rotation of said armature. and means controlled by current from said generator for varying the fluid pressure on said brake controlling device.

.2. In an electropneumatic brake, the combination with a device controlled by fluid under pressure for effecting an application of the brakes, of an electric generator having a rotatable armature, a rack and pinion for rotating said armature, a piston operated by flllld under pressure for actuating said rack and pinion, and means controlled by current from said generator for controlling the fluid pressure on said brake controlling device.

3. In an elect-ro-pneumatic brake, the combination with a brake pipe and a valve device operated upon a reduction in brake pipe pressure for effecting an application of the brakes, of an electric generator having a rotatable armature, means operated by fluid under pressure supplied by said valve device upon applying the brakes for rotating said armature, and means controlled by current from said generator for effecting an application of the brakes.

. 4. In an electro-pneumatic brake, the combination with a fluid pressure brake, of an electric generator having a rotatable armature, means operated by fluid from the brake system for rotating said armature mechanism controlled by current from said generator for effecting an application of the brakes, and a fly-wheel rotating with said armature for rotating said armature after said' means ceases to act.

In testimony whereof I have hereunto set ::my hand.

WALTER V. TURNER. 

